In this lesson for What’s New in macOS Catalina, I look at how you can use your iPad as a second display for your Mac with Sidecar. With Sidecar and macOS Catalina, you can mirror your display on the iPad, or use it as a second display. When used as a second display, you can move windows from your Mac to your iPad. With Sidecar, you also have access to your Touch Bar (if your Mac has a Touch Bar), and other features. You can set if you want to show these and where you want to show these features on the iPad.